From: Pietro Pugni <pietro.pugni@gmail.com>
To: Jeff Janes <jeff.janes@gmail.com>
Cc: PostgreSQL Performance <pgsql-performance@postgresql.org>
Subject: Re: Can't get Dell PE T420 (Perc H710) perform better than a MacMini with PostgreSQL
Date: Tue, 7 Apr 2015 19:17:40 +0200
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I meant “collation”, not “collection”.
Pietro
Il giorno 07/apr/2015, alle ore 18:49, Pietro Pugni <pietro.pugni@gmail.com> ha scritto:
>
>> On Tue, Apr 7, 2015 at 6:27 AM, Pietro Pugni <pietro.pugni@gmail.com> wrote:
>> Hi Jeff,
>> sorry for the latency but server was down due to a error I made in the sysctl.conf file.
>>> Yes, but are the defaults for those two systems? on psql, use \l to see.
>>>
>>
>> \l returns the following:
>>
>> T420 (Postgres 9.4.1)
>> List of databases
>> Name | Owner | Encoding | Collate | Ctype | Access privileges
>> -----------+----------+----------+-------------+-------------+-----------------------
>> grep | grep | UTF8 | en_US.UTF-8 | en_US.UTF-8 |
>> postgres | postgres | UTF8 | en_US.UTF-8 | en_US.UTF-8 |
>> template0 | postgres | UTF8 | en_US.UTF-8 | en_US.UTF-8 | =c/postgres +
>> | | | | | postgres=CTc/postgres
>> template1 | postgres | UTF8 | en_US.UTF-8 | en_US.UTF-8 | =c/postgres +
>> | | | | | postgres=CTc/postgres
>> (4 rows)
>>
>>
>>
>> MacMini (Postgres 9.0.13)
>> List of databases
>> Name | Owner | Encoding | Collation | Ctype | Access privileges
>> -------------------+------------+----------+-----------+-------+-------------------------
>> caldav | caldav | UTF8 | C | C |
>> collab | collab | UTF8 | C | C |
>> device_management | _devicemgr | UTF8 | C | C |
>> pen | pen | UTF8 | C | C |
>> postgres | _postgres | UTF8 | C | C |
>> roundcubemail | roundcube | UTF8 | C | C |
>> template0 | _postgres | UTF8 | C | C | =c/_postgres +
>> | | | | | _postgres=CTc/_postgres
>> template1 | _postgres | UTF8 | C | C | =c/_postgres +
>> | | | | | _postgres=CTc/_postgres
>> (8 rows)
>>
>>
>> The difference between the "C" and the "en_US" collation is entirely sufficient to explain the difference in performance. "C" is the fastest possible collation as it never needs to look ahead or consult tables, it just compares raw bytes.
>>
>> Cheers,
>>
>> Jeff
>
> Hi Jeff,
> is there a way to set a default collection during compiling or in the configuration file? I have never specified one, so I suppose that somewhere on MacMini “C” collation type is set as the default one.
>
> Thank you a lot.
> Best regards,
> Pietro
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To: pgsql-performance@postgresql.org
Cc: pietro.pugni@gmail.com, jeff.janes@gmail.com
Subject: Re: Can't get Dell PE T420 (Perc H710) perform better than a MacMini with PostgreSQL
In-Reply-To: <697FB244-B9B8-4918-AEAC-20FD5539C0E8@gmail.com>
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